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I am working on plotting range-velocity heatmap of the receiving FMCW signal. I actually have already plotted. However, I do not really understand the mapping relationship between Doppler FFT bin and velocity. I learned to map from 1d FFT bin to range with the following codes as the x-axis.

x = (0:ADCsample-1) - ADCsample/2;
x = x*Fs/ADCsample;
% freq to dist;
x = x*3e8/2/slope;

Some notes, I plot the 2D FFT with nFFT = No of chirp in one frame =64.

enter image description here

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